FURNACE & HVAC FILTER REPLACEMENT IN NORTH LOUISIANA

A clogged filter is behind more HVAC breakdowns than almost anything else. When the filter chokes with dust, the blower strains, the system runs hot in summer and short-cycles in winter, and parts wear out years early. In North Louisiana — with our heavy pollen, long humid summers, and the dust that comes with them — filters load up faster than most homeowners expect. Mark Johnson & Sons keeps yours changed, matched, and doing its job.

The tech who shows up is on our payroll — no subcontractors — and pricing is flat-rate and simple. A skipped filter is the quiet cause behind frozen coils, burned-out blower motors, and dead capacitors, and it's the easiest failure in the whole system to prevent. Below is what we handle, how to pick a rating, and why the filter is the single best-value maintenance you can buy.

What we service

• Standard 1-inch filters — pleated and fiberglass, the sizes most furnaces and air handlers take
• High-MERV pleated media — MERV 8 to 11, more filtration for dust, pollen, and pet dander
• Whole-house media cabinets — thick 4-to-5-inch filters (Aprilaire, Honeywell, Trane) that change less often
• Media cabinet installs — adding a proper filter housing to a system that never had one
• Change schedules — sized to your home's pets, pollen, and dust load so you never run on a clogged filter

Getting the MERV rating right

Higher isn't automatically better. A filter that's too restrictive for your blower cuts airflow, which makes the furnace run hot and the AC coil freeze — the opposite of what you wanted. For a typical North Louisiana home, MERV 8 to 11 is the sweet spot: enough to catch dust, pollen, and dander, without starving the equipment. We match the rating to your specific furnace and blower so you get cleaner air and strong airflow both.

What Mark Johnson & Sons does differently

We seat the filter right, facing the correct airflow direction, and verify the system is breathing easy before we leave — a backwards or loose filter lets unfiltered air slip past and defeats the whole point. Add it to a tune-up or set up a coordination plan and you never think about it again. Our service savings agreement plans — from $189/year — cover a Spring AC and Fall heating tune-up plus an annual plumbing check-up, so the filter gets handled at least twice a year, and service members get 15% off repairs and priority scheduling.